Square mug



FIG. 1 is a perspective view of a square mug showing our new design;

FIG. 2 is another perspective view thereof;

FIG. 3 is a top view thereof;

FIG. 4 is a front view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a left side view thereof, the rear view being identical to FIG. 6; and,

FIG. 7 is a bottom view thereof. 

CLAIM The ornamental design for the square mug, as shown and described. 